#!/usr/bin/env node
const fs = require('fs');
const path = require('path');
const buildTask = require('./build-task');

// 返回第几章内容
function checkChapter(fileName) {
  for(let i = 1; i < 12; i++) {
    const chapterDir = `chapter${`0${i}`.slice(-2)}`;
    if(fs.existsSync(path.resolve(__dirname, '..', chapterDir, fileName))) {
      return i;
    }
  }
  if(fs.existsSync(path.resolve(__dirname, '..', 'glsl', fileName))) {
    return 'glsl';
  }
  if(fs.existsSync(path.resolve(__dirname, '..', 'misc', fileName))) {
    return 'misc';
  }
  return 0;
}

/* eslint-enable no-console */
(async function () {
  await buildTask({production: true});

  const root = path.resolve(__dirname, '../docs');
  const pa = fs.readdirSync(root);
  const pages = pa.map((el) => {
    const file = path.resolve(root, el);
    const info = fs.statSync(path.resolve(file));
    if(info.isFile() && /.html$/.test(el)) {
      const chapter = checkChapter(el.slice(0, -5));

      const content = fs.readFileSync(file).toString('utf-8');
      const matched = content.match(/<title>(.*)<\/title>/im);
      if(matched) {
        const linkText = `${matched[1]} (${el})`;
        return [linkText, el, chapter];
      }
    }
    return null;
  }).filter(e => e).sort((a, b) => a[2] - b[2]);

  const buildItem = p => `<li><a href="/${p[1]}" target="_blank">${p[0]}</a></li>`;

  const output = `
<html>
  <head>
    <title>Interactive Computer Graphics —— WebGL</title>
  </head>
  <body>
  ${[...Array.from({length: 12}).map((_, i) => {
    const list = pages.filter(p => p[2] === i + 1);
    if(list.length) {
      return `<h2>第${i + 1}章</h2><ul>${list.map(buildItem).join('')}</ul>`;
    }
    return '';
  }),
  `<h2>glsl 练习</h2><ul>${pages.filter(p => p[2] === 'glsl').map(buildItem).join('')}</ul>`,
  `<h2>其他</h2><ul>${pages.filter(p => p[2] === 'misc').map(buildItem).join('')}</ul>`,
  ].join('')}
  <div id="github_fork" style="position:absolute;top:0;right:0;width:80px;height:80px;z-index:99999;">
    <a href="https://github.com/akira-cn/ICG-WebGL">
      <svg viewBox="0 0 250 250" aria-hidden="true" color="#fff">
        <path d="M0,0 L115,115 L130,115 L142,142 L250,250 L250,0 Z"></path>
        <path d="M128.3,109.0 C113.8,99.7 119.0,89.6 119.0,89.6 C122.0,82.7 120.5,78.6 120.5,78.6 C119.2,72.0 123.4,76.3 123.4,76.3 C127.3,80.9 125.5,87.3 125.5,87.3 C122.9,97.6 130.6,101.9 134.4,103.2" fill="currentColor" style="transform-origin: 130px 106px;" class="octo-arm"></path>
        <path d="M115.0,115.0 C114.9,115.1 118.7,116.5 119.8,115.4 L133.7,101.6 C136.9,99.2 139.9,98.4 142.2,98.6 C133.8,88.0 127.5,74.4 143.8,58.0 C148.5,53.4 154.0,51.2 159.7,51.0 C160.3,49.4 163.2,43.6 171.4,40.1 C171.4,40.1 176.1,42.5 178.8,56.2 C183.1,58.6 187.2,61.8 190.9,65.4 C194.5,69.0 197.7,73.2 200.1,77.6 C213.8,80.2 216.3,84.9 216.3,84.9 C212.7,93.1 206.9,96.0 205.4,96.6 C205.1,102.4 203.0,107.8 198.3,112.5 C181.9,128.9 168.3,122.5 157.7,114.1 C157.9,116.9 156.7,120.9 152.7,124.9 L141.0,136.5 C139.8,137.7 141.6,141.9 141.8,141.8 Z" fill="currentColor" class="octo-body">
        </path>
      </svg>
    </a>
  </div>
  </body>
</html>
  `;

  // console.log(output);
  fs.writeFileSync('./docs/index.html', output);
}());